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Northern Ireland Geology-Shale and Greywaches. Shale is a fine grained sedimentary rock which splits easily. It can contain fossils such as graptolites which are characteristic of the Silurian and Ordovician Periods. Some excellent shale outcrops with numerous graptolites can be found along the coast around Donaghadee.
Shale is a pure sedimentary rock made of very fine silt and clay and falls in the category of mud stones. Its grain size is less than 1/256mm. It forms in deep water eg at oceanic trenches where all the suspended material gets settled in the quite waters.